He is one of 381 ex-MPs and ministers who are still allowed to roam about the Palace of Westminster and subsidised facilities.

The latest details were released by the Commons authorities following a Freedom of Information request by the Press Association, according to Mirror Online.

MPs who have served at least one full parliamentary term are eligible to apply for the 'Category X' passes.

The scheme is intended to smooth the process of returning to civilian life - but questions have been raised about the potential for lobbying of former colleagues and whether individuals should retain access to the estate.

As of June 22, 381 ex-members held a pass - up from 356 in a previous list that dated from just a few days after the election.

Sir Malcom is being probed by the Commons standards watchdog for allegedly breaking lobbying rules. He denies any wrongdoing.